How to use “ in case “ and “if”

1. Precautions -
== We usually use “in case” when we talk about precautions and things we must do to be ready for something possible that might happen in the future.

- Example:
a. I think we should leave a little early especially during Fridays, in case there’s a lot of traffic to avoid us coming late in the office. (People usually might experience heavy traffic during these days because that is the time workers and students go back to their home or provinces.)
== We use a present tense after in case to talk about the future.

2. In case …should
We use should + infinitive (with a similar meaning of might ) after “in case” that also means “by chance”.

- Example:
a.My mother prepared more food in case my cousins should stay at dinner.
Also this sentence structure is common especially about the past.

- Example
a.I saved her number in my mobile phone in case I should forget it.

3. In case and if
Both are usually used in different ways:
++ Let’s study our lessons in case we have an exam. (It means let is study our lesson we might have an exam.)
== Let’s study our lessons if we have an exam. (It means that if we will have an exam, we will study. But if not we wont.)

4. In case of – this prepositional phrase has a wider meaning than “in case” and can be used in situations similar to “if”.

- Example
In case of emergency, please call this number +6909479992194. ( If there is an emergency situation…)